- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Elements that occur preferentially in minerals free of oxygen (or fluorine or chlorine); i.e., mostly as sulfides, selenides, tellurides, arsenides, antimonides, intermetallic compounds, native elements, etc. This group includes some of the chalcophile and some of the siderophile elements as classified by Goldschmidt.
Industry:Mining
Elevator used to transport workers in a lined shaft; available in open, semienclosed or fully enclosed models with a choice of sliding, folding, or rollup doors. Cages are used in either vertical or incline mine shafts. All cages are required to contain necessary safety features.
Industry:Mining
Elongated crystals, tapering at each end to a fine point, as those typical of martensite.
Industry:Mining
Elongation of metal wire, tube, or rod by drawing it while heated through a constricting orifice. Opposite of cold-drawn.
Industry:Mining
Embrittlement of steel or wrought iron when hot, usually due to excessive sulfur content.
Industry:Mining
Emeralds from the ancient Egyptian mines of Jabal Sukayt and Jabal Zab-rah east of Aswan, in mica schist and talc schist.
Industry:Mining
Emergency, crude repair of a bit made by a drill runner at the drill site.
Industry:Mining
Emery similar to spinel emery but contains in addition from 30% to 50% plagioclase feldspar. Pure magnetite often is found in streaks within this mass.
Industry:Mining
